Adam Peaty claims 100m breaststroke world record but Hannah Miley fails again

James Guy and Max Litchfield end empty handed as wait continues for first Rio medal.

Hannah Miley, James Guy and Max Litchfield all missed out on becoming Great Britain's first medallists at the Rio 2016 Olympic Games after failing to trouble the podium on the opening day of the swimming competition. Miley looked destined for her maiden Olympic medal but as Hungary's Katinka Hosszu smashed the world record on her way to gold, Mireia Belmonte came back to complete the podium in the women's 400m individual medley.

"I had nothing left," the Scot told BBC Sport. "I gave it everything I had. I am happy that I went faster than I did in my heat, better than I did in London but it is so hard because it was so close. It's happy and disappointment all at once."

Guy also looked on course for a medal in the men's 400m freestyle only to fall away with two lengths to go. The 20-year-old set the pace through the first 200m - the distance over which he is the current world champion - but fell away. Mack Horton of Australia took gold ahead of former drugs cheat Sun Yang.

"There was no pressure," said Guy, who begins his 200m freestyle campaign on day two. "I tried to go out fast and hold on. The last 100m I thought "oh no" but it's great to be here I just want to fight for the medals. The first 200m was pretty comfortable to be honest so we head into tomorrow and we'll see what we've got."

Meanwhile, Litchfield was not expected to feature in the medals in the 400m individual medley but came agonisingly close to causing a surprise. Japan took gold and bronze through Kosuke Hagino and Daiya Seto finishing either side of Chase Kalisz of American

"Shame to come fourth and just miss out but two PBs in one day, I can't complain with that really," Litchfield said. "There are always things you can go back and work on just after you've raced. There are defending things I know I can work on. I'll go back next year and put those things in place and come back stronger."

The positives for Britain in the pool on day one came in the form of Adam Peaty, who broke his own world record on the way to qualifying for the 100m breaststroke final. The Uttoxeter swimmer recorded a time of 57.55 seconds in his opening heat before winning his semi-final with the second fastest time in history as he hones in on adding Olympic gold to his world title.